Added Config.DatabaseAddress

This allows the server to connect to a MySQL server in a different
machine.

config.json.sample

@@ -4,6 +4,7 @@
   "ApiPrefix": "",
   "KeyFile": "",
   "CertFile": "",
+  "DatabaseAddress": "",
   "Database": "openaccounting",
   "User": "openaccounting",
   "Password": "openaccounting",

core/model/types/config.go

@@ -6,6 +6,7 @@ type Config struct {
 	ApiPrefix       string
 	KeyFile         string
 	CertFile        string
+	DatabaseAddress string
 	Database        string
 	User            string
 	Password        string

core/server.go

@@ -2,16 +2,17 @@ package main
 
 import (
 	"encoding/json"
+	"log"
+	"net/http"
+	"os"
+	"strconv"
+
 	"github.com/openaccounting/oa-server/core/api"
 	"github.com/openaccounting/oa-server/core/auth"
 	"github.com/openaccounting/oa-server/core/model"
 	"github.com/openaccounting/oa-server/core/model/db"
 	"github.com/openaccounting/oa-server/core/model/types"
 	"github.com/openaccounting/oa-server/core/util"
-	"log"
-	"net/http"
-	"os"
-	"strconv"
 	//"fmt"
 )
 
@@ -31,7 +32,7 @@ func main() {
 		log.Fatal(err)
 	}
 
-	connectionString := config.User + ":" + config.Password + "@/" + config.Database
+	connectionString := config.User + ":" + config.Password + "@" + config.DatabaseAddress + "/" + config.Database
 
 	db, err := db.NewDB(connectionString)